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Can we infer that 150GB platter designs are even more reliable than 200GB designs. It's disappointing to see the review accept Hitachi's statement without question, going so far as to even applaud Hitachi for its approach without any evidence whatsoever to back it.
I think anything larger than 512MB always had 512KB. Then it gets progressively worse as you get up to the 500GB size drives. Not a very significant change despite doubling the cache again, since the drive size also increased, and it'll only get worse as they increase the drive size.